It is a useful identifier only in the context of how black men a different (from "normal men"?). Most of the time black men are just men, but there are a few ways they are different. If you are not specificity trying to bring out one of that cases where black men a different you are continuing the idea that black men are different which doesn't help most of the cases where they are different. There are a couple medical instances where black men are different that should remain, but for the most part differences between black men and [normal?] men are just about discrimination and so if that doesn't apply to what you are talking about then black men is a harmful lable.
